This is very likely a criminal scam because: They call numbers on the do not call list. They do not leave a message on the answering machine, Google cannot find a commercial company with this number.

The caller first ask to speak with Mrs Harte, when I advised that there was no Mrs Harte, the caller ask for me, I advised that I was unavailable. I asked if there was a message and caller advised that he would call back.

This number has called ours about half-a-dozen times.  Our caller ID displays "TRI" along with the number in question.  Whenever there is a number or "caller ID" that we do not recognize we shout out: "Let the machine get it..."  This practice was for our children to learn not to answer any number they do not know when they are home alone.  George is correct; they do not leave a message.  The last time they called, I answered speaking Spanish "Hola, Buenos Tardes..."  Then a woman asked to speak to Mr. A----- pronouncing one of the letters that our long distance provider heard wrong, published, did not correct after we tried and is consistently printed wrong on our monthly bill.  I replied "?habla Espanol?"  She said "No" and hung up.  I believe that our LDP may be selling their information or she simply found it on-line because it is published in our local white pages.

They call our house multiple times a week and when anyone answers the phone no one is on the other end then the call goes dead.

Has called several times in the last few weeks. Calls but never leaves message. Today I picked up and was immediately disconnected. Very irritating.